Tackle block



Dec. 13', '1932. JANSSEN 1,890,992

TACKLE BLOCK Filed May 16, 1951 2 Sheets-Sheet l lNVENTOR UZQIYJF/ZSSE/ZATTORNEY Dec. 13, 1932, c. F. JANSSEN TACKLE BLOCK Filed May 16, 1931 2Sheets-Sheet 2 C/zar/e Patented Dec. 13, 1932 Y UNITED STATES PATENTOFFICE CHARLES E. J'ANSSEN, OF AsToRIA NEw YORK TACKLE BLOCK Applicationfiled May 16, 1931. Serial No. 537,849.

This invention relates to hoisting devices in section, showing my ropearresting device of the block and tackle type in general, and inoperative position. particularly to the kind known as self-lock- Fig. isa similar partial side elevation of ing in which a cord, cable, rope orthe like the block, with the rope arresting'means in 5 is permitted tounrestrictedly move or travel rope engaging position. a 55 in onedirection, While it is automatically Fig. 6 is a top view of the block,with the gripped and firmly held when its motion is able arrestingdevice in plan view.-

reversed, and which grip hold may be in- Referring now specifically toFigs; 1 and stantly released through a slight pull upon 2, numeral 10 isconventional, double pulley 10 the gripping provisions. tackle block, towhich is attached by means 60 The prime object of my invention residesof cable, thimble 11 of cable or rope 12. Bein providing in connectionwith a hoisting 10W lock 10 is arranged a double pulley device of thiskind employing cord, rope or tackle block 13 of my special construction,the like an automatically operable and manuwhich consists of cheekmembers 14, pointed i 15 ally releasable rope gripping device which is atheir lower ends, while their upper ends 6 so constructed as to normallyhave the tendare w ened up. ency of positively engaging the rope whileOn observing Fig. 2, it will be seen that the the latter is either inmotion in one direction, left hand upper corner 15 is somewhat lower orat standstill, and to actually grip and hold h n the left hand uppercorner '16 of the a the rope or the like against movement when cheeks. Aconventional strap 17 passes about the otion of th o i r r d, the cheeksand provides suspension means for Another object of my invention is toprohook 18. vide in connection with a hoisting device of The arrangementof my cable locking dem this kind a block with specially designed Vicemay be best understood from Figs. 3, 4, cheeks adapted to engage theouter surfaces 5 n 6, wh re sheave pin 19 is shown pass- 75 of a rope orcable, and a, rope or cable, brake 111g tllIOIlgll .strap 17 whichextends above centrally disposed between the cheeks and the ve t0 theupper center of the cheek the inner surfaces of the cable for lockingthe members 14, where another pin 20 is secured. n latte i l Between thecheek members, and disposed A still further object of my invention is toat h l w r c rner 15 and the upper corner provide with said cable brakea releasing 16 BI Of, are Spa ers 21 and 22 respectively, lever,operable manually from without the Whifih a g d at different levels.They bl k h k d id d with spring conare held in position by rivets orother suitable trolled ean for k i g th l d means and their innersurfaces are hollowed thereby the cable brake in a position at which outas le rly en in Fig- 6, at 23 for normalthe latter will always engage,or have the y aq mrlmedatlng a rope or cable, and for tendency to engagethe inner surfaces of the faclhtatmg ms pp as Wlubeexplalned cable. P ey- The foregoing and still further objects of plvotauy moulged t upperpm my invention will become more fully apparg 'i cheliqklmem 14 1Srlnybcable fif ent from the following description, and the evlcecompnses m 24 W lch tends at both ends and su ort b th 'd s p t l formmgPart of thls jaws or gripping members prbvfded vivit h V bpec} i and mwhlchz hollowed-out engaging faces 26, adapted to 4.) Fig. 1 1s an endelevatlon of my hoisting grip the inner Surfaces of the Cables. vFrom fcQnstrllcted as Present Preferredthe center of hub 24 extends over thelower l a slde elevatlol} theleofspacer 21 an operating lever 27,equipped Flg. 3 IS a front QlGVflt-IOH Of 2111 enlarged with a ropeengaging QVQQ8 andproviddetail view of my tackle block. ed with a springcontrolled pin 29, intended 50 Fig. 4 is a side elevation thereof,partially to bear against spacer 21 and normally push lever 27 intoupward position, thereby causing the jaws of gripping members 25 to besteadily in a so to speak dragging engagement with the cable strands.

Pin 29 may be adjusted by means of a screw cap 30, whereby the tensionof the spring bearing against the pin may be regulated.

Associated with eye 28 of lever 27 is a pull rope 31, which, whenoperated, causes lever 27 to swing downwards, as shown in Fig. a,whereby the jaws of cable gripping members 25 are brought out ofengagement with and into cleared position relative to the cableportions.

When pull rope 81 is released, and when the movement of the cable isreversed to that at which a load is hoisted by the device, grippingmembers 25 will immediately wedge the cable portions against stationarygripping or spacer members 22, as illustrated in Fig. 5, and lever 27will swing upwards. The function of my device is automatic and preventsback-slipping of the cables during hoisting operation, or when the suchoperation is temporarily stopped.

Reverting again to Fig. 1, I have shown that the cable extends fromthimble 11 downwards, passes over left hand sheave of the lower block,then upwards to and over the left hand sheave of the upper block, thendownwards again and over the right hand sheave of the lower block, andup and over the right hand sheave of the upper block. From that sheavethe cable extends outwards and forms the engaging or operating end 32.

One of the outstanding advantages of my arrangement resides in itssafety. Assuming that the cable breaks at any point, the grippingmembers 25 will immediately function and engage the cable portionsremaining in the lower block and lock them against further movement,thereby preventing the load from falling and causing damage or injury tothe operator.

While I have shown a specific form of my double sheave device, triple,quadruple sheave blocks, and other changes and improvements may bereadily incorporated, and I therefore reserve for myself the right tomake such changes and improvement within the broad scope of myinvention, as set forth in the annexed claim.

I claim:

In a multiple sheave block, a pair of cheek members, a plurality ofstationary cable engaging spacers, a plurality of pivotally mountedcable gripping members operatively located between said spacers andforming one movable unit, a releasing arm extending from the unit, aspring controlled member slidable in a recess in said arm and bearingagainst one of said spacers and adapted to normally elevate said arm,thereby keeping said cable gripping members normally in light engage-CHARLES F. JANSSEN.

